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Method for detecting cold brittleness transition temperature of metal material

A metal material, transition temperature technology, applied in the direction of analyzing materials, using sonic/ultrasonic/infrasonic waves for material analysis, measuring devices, etc. To achieve the effect of high test efficiency, accurate and reliable data, and high academic research value

Active Publication Date: 2017-04-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Over the years, a series of research work has been carried out at home and abroad on the measurement of low-temperature toughness, and corresponding results have been achieved. The most representative method is the Charpy impact test, which has become a normative experiment for low-temperature cold brittleness testing of materials. Long cycle, high consumption of equipment and materials, etc., making it difficult to promote on a large scale
[0004] Low temperature is an important factor leading to brittle fracture of steel structures, especially the cold and brittle characteristics of low-carbon steel components, which has made the measurement of the cold and brittle transition temperature an important basis for preventing cold and brittle accidents. The determination of the cold and brittle temperature is still an artificial agreement based on the analysis results of the cold and brittle accident and some experimental phenomena.
The reason is that there are many factors that affect the brittle-ductile transition of materials, and many factors such as crystal structure, chemical composition, and microstructure all affect the cold-brittle transition temperature, which leads to a large deviation between the actual cold-brittle transition temperature measurement data and the actual one. Difficult to meet the needs of design work

Method used

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  • Method for detecting cold brittleness transition temperature of metal material
  • Method for detecting cold brittleness transition temperature of metal material
  • Method for detecting cold brittleness transition temperature of metal material

Examples

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Embodiment 1

[0033] In this embodiment, normalized No. 45 ordinary carbon steel sample is selected and processed into a cylindrical sample of 8 mm × 120 mm; the Agilent 33220A frequency synthesizer is used as the signal source, and the Tektronix TDS-2002B oscilloscope observes the signal, and the signal is amplified and band-passed. filter, the schematic diagram is as figure 1 As shown, the amplitude-frequency characteristic curve of the band-pass filter at 2KHz frequency point is as follows figure 2 As shown, the exciter is an electromagnetic exciter with a working frequency range of 0.1~2KHz±3DB, and the vibrator is a tartaric acid crystal with a working frequency range of 0.5~3KHz±2DB.

[0034] The specific implementation process of this embodiment: hang the two ends of the sample in the low-temperature container with cotton thread, the hanging position is near the node position of the sample, and the other section of the cotton thread is respectively the exciter and the vibration pick...

Embodiment 2

[0036] In this example, the annealed Q460 sample is selected and processed into a sample of 8 mm×10 mm×200 mm. The Agilent33220A frequency synthesizer is used as the signal source, and the Tektronix TDS-2002B oscilloscope observes the signal, and the signal is amplified and band-pass filtered. The schematic diagram is as follows figure 1 As shown, the amplitude-frequency characteristic curve of the band-pass filter at 2KHz frequency point is as follows figure 2 As shown, the exciter is an electromagnetic exciter with a working frequency range of 0.5~2KHz±4DB, and the vibrator is an electromagnetic vibrator with a working frequency range of 1~3KHz±3DB.

[0037] The specific implementation process of this embodiment: the sample, the exciter, and the vibration pick-up are placed in a low-temperature container, the contacts of the exciter and the vibration pick-up are placed horizontally upwards, the distance between the contacts is 120 mm, and the left and right sides of the samp...

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Abstract

The invention relates to a method for detecting the cold brittleness transition temperature of a metal material, and belongs to the field of material performance test. The method comprises the following steps: taking a metal material to be detected, making a sample from the metal material to be tested, gradually reducing the temperature of the sample in a low temperature container, measuring the resonance frequency of the sample at different temperature points, drawing a temperature-resonance frequency curve map, and obtaining the cold brittleness transition temperature of the metal material, which is the temperature corresponding to an inflection point in the temperature-resonance frequency curve map or to a gradient change point. The method is suitable for measuring the cold brittleness transition temperature of the metal material, provides a brand new measurement way for cold brittleness measurement, and has the characteristics of good test accuracy and convenience in test.

Description

technical field [0001] The invention relates to a method for measuring the cold-brittle transition temperature of metal materials, belonging to the field of material performance testing. Background technique [0002] In extremely low temperature weather and cold sea areas in winter, steel towers, ships and other components of metal structures are likely to cause low temperature cold and brittle failures below the yield stress. Therefore, it is of great significance to measure the cold-brittle transition temperature of materials and provide necessary data for component material selection to prevent low-temperature brittle fracture, both in national production and national defense construction. [0003] Over the years, a series of research work has been carried out at home and abroad on the measurement of low-temperature toughness, and corresponding results have been achieved. The most representative method is the Charpy impact test, which has become a normative experiment for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/045G01N2291/02827G01N2291/0234
Inventor 傅强胡劲段云彪翟又文吴兴蛟姜晰
Owner KUNMING UNIV OF SCI & TECH
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